Why is long form periodic table regarded better than the Mendeleev's periodic table?
Long form periodic table is regarded as better than the Mendeleev’s table due to the following reasons:
| Long form periodic table | Mendeleev's |
| 1. All elements have been arranged in the increasing order of atomic numbers. | 1. Elements have been arranged in the increasing order of atomic masses. |
| 2. The position of hydrogen has been justified. | 2. There is no justification for the position of hydrogen. |
| 3. It takes into consideration the filling of the electrons in s, p, d and f subshell. | 3. It takes into consideration only the atomic numbers of the element. |
| 4. The table has been divided into four blocks i.e. s, p, d and f block. | 4. There are no blocks in the table. |
| 5. Groups are not further sub-divided into subgroups. | 5. There are sub-groups (A and B) in each group. |
| 6. This is simple and easy to reproduce. | 6. This is quite difficult to reproduce. |
What is long form of the periodic table? Discuss in brief its salient structural features.
Which element do you think would have been named by:
(i) Lawrence Berkeley Laboratory
(ii) Seaborg's group?
